kernel/linux.git/drivers/memory/tegra/Kconfig, branch v7.2-rc1

memory: tegra: Add Tegra114 EMC driver

2026-05-04T18:47:18+00:00

Introduce driver for the External Memory Controller (EMC) found in Tegra114 SoC. It controls the external DRAM on the board. The purpose of this driver is to program memory timing for external memory on the EMC clock rate change. Signed-off-by: Svyatoslav Ryhel Reviewed-by: Mikko Perttunen Link: https://patch.msgid.link/20260427070312.81679-5-clamor95@gmail.com Signed-off-by: Krzysztof Kozlowski

memory: tegra: Deduplicate rate request management code

2026-05-04T17:16:48+00:00

As is, the EMC drivers for each 32-bit platform contain almost identical duplicated code for aggregating rate requests. Move this code out to a shared tegra-emc-common file to reduce duplication, and add kerneldoc comments. Based on code from the tegra20-emc driver. Signed-off-by: Mikko Perttunen Link: https://patch.msgid.link/20260501-memory-refactor-v3-1-69fb1ae1a7ca@nvidia.com Signed-off-by: Krzysztof Kozlowski

memory: tegra: Do not enable by default during compile testing

2025-04-15T05:43:54+00:00

Enabling the compile test should not cause automatic enabling of all drivers. Link: https://lore.kernel.org/r/20250404111703.235455-2-krzysztof.kozlowski@linaro.org Signed-off-by: Krzysztof Kozlowski

memory: tegra30-emc: Print additional memory info

2022-01-27T09:40:34+00:00

Print out memory type and LPDDR2 configuration on Tegra30, making it similar to the memory info printed by the Tegra20 memory driver. This info is useful for debugging purposes. Tested-by: Svyatoslav Ryhel # T30 ASUS TF201 LPDDR2 Signed-off-by: Dmitry Osipenko Link: https://lore.kernel.org/r/20211222043215.28237-1-digetx@gmail.com Signed-off-by: Krzysztof Kozlowski

memory: tegra20-emc: Support matching timings by LPDDR2 configuration

2021-10-15T07:52:47+00:00

ASUS Transformer TF101 doesn't provide RAM code and in this case memory timings should be selected based on identity information read out from SDRAM chip. Support matching timings by LPDDR2 configuration. Signed-off-by: Dmitry Osipenko Link: https://lore.kernel.org/r/20211006224659.21434-10-digetx@gmail.com Signed-off-by: Krzysztof Kozlowski

memory: tegra: Enable compile testing for all drivers

2021-06-03T12:24:03+00:00

Enable compile testing for all Tegra memory drivers. Reviewed-by: Krzysztof Kozlowski Signed-off-by: Dmitry Osipenko Signed-off-by: Thierry Reding

memory: tegra124: Support interconnect framework

2021-01-05T17:03:22+00:00

Now Internal and External memory controllers are memory interconnection providers. This allows us to use interconnect API for tuning of memory configuration. EMC driver now supports OPPs and DVFS. Tested-by: Nicolas Chauvet Acked-by: Georgi Djakov Signed-off-by: Dmitry Osipenko Link: https://lore.kernel.org/r/20201228154920.18846-4-digetx@gmail.com Signed-off-by: Krzysztof Kozlowski

memory: tegra124-emc: Make driver modular

2021-01-05T17:00:09+00:00

Add modularization support to the Tegra124 EMC driver, which now can be compiled as a loadable kernel module. Note that EMC clock must be registered at clk-init time, otherwise PLLM will be disabled as unused clock at boot time if EMC driver is compiled as a module. Hence add a prepare/complete callbacks. similarly to what is done for the Tegra20/30 EMC drivers. Tested-by: Nicolas Chauvet Signed-off-by: Dmitry Osipenko Link: https://lore.kernel.org/r/20201228154920.18846-2-digetx@gmail.com Signed-off-by: Krzysztof Kozlowski

memory: tegra30: Support interconnect framework

2020-12-05T13:54:36+00:00

Now Internal and External memory controllers are memory interconnection providers. This allows us to use interconnect API for tuning of memory configuration. EMC driver now supports OPPs and DVFS. MC driver now supports tuning of memory arbitration latency, which needs to be done for ISO memory clients, like a Display client for example. Signed-off-by: Dmitry Osipenko Tested-by: Peter Geis Acked-by: Georgi Djakov Acked-by: Thierry Reding Link: https://lore.kernel.org/r/20201203192439.16177-4-digetx@gmail.com Signed-off-by: Krzysztof Kozlowski

memory: tegra30-emc: Make driver modular

2020-11-26T17:50:36+00:00

Add modularization support to the Tegra30 EMC driver, which now can be compiled as a loadable kernel module. Signed-off-by: Dmitry Osipenko Link: https://lore.kernel.org/r/20201111011456.7875-8-digetx@gmail.com Signed-off-by: Krzysztof Kozlowski